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TT: Fachverband Tiefe Temperaturen
TT 78: Spin Transport and Orbitronics, Spin-Hall Effects II (joint session MA/TT)
TT 78.3: Talk
Thursday, March 21, 2024, 15:30–15:45, EB 107
Spin-orbitronics in two dimensional systems: Orbital magnetization, orbital Hall effect and orbital Edelstein effect — •Börge Göbel1, Oliver Busch1, Annika Johansson2, Manuel Bibes3, and Ingrid Mertig1 — 1Institut für Physik, Martin-Luther-Universität Halle-Wittenberg — 2Max-Planck-Institut für Mikrostrukturphysik, Halle — 3Unité Mixte de Physique, CNRS, Thales, Paris
The orbital contribution to the magnetization is often quenched by the crystal field which is why it is typically significantly smaller than the spin contribution, in equilibrium. In this talk, I will present the generation of a large orbital magnetization and orbital currents.
In non-collinear spin textures, crystal symmetries are broken and the quenching is lifted. In topologically non-trivial skyrmion crystals, for example, the emergent field forces electrons on orbital trajectories which leads to the generation of a considerable orbital magnetization [1]. Likewise, an orbital Hall effect with orbital edge states arises in non-magnetic Kagome nanoribbons [2]. In two-dimensional electron gases (2deg), e.g. at the interface of STO/AlO [3,4] or KTO/AlO [5], the inversion symmetry is broken so that an (inverse) Edelstein effect arises. The application of a charge current leads to the generation of spin and orbital magnetization densities and vice versa.
[1] BG et al. PRB 99, 060406 (2019)
[2] Busch, Mertig, BG, PRResearch 5, 043052 (2023)
[3] Vaz, BG et al. Nature Materials 18, 1187 (2019)
[4] Johansson, BG et al. PRResearch 3, 013275 (2021)
[5] Varotto, BG et al. Nature Communications 13, 6165 (2022)
Keywords: Orbitronics; Spinorbitronics; Orbital Hall effect; Orbital Magnetization; Skyrmions